Photocatalytic hydrogen peroxide (H2O2) production offers a sustainable alternative to the conventional anthraquinone process. However, most inorganic semiconductors exhibit poor selectivity and significant decomposition of the generated H2O2. In this study, we report the synthesis and photocatalytic evaluation of furan-pyrrole polymers (FPP) featuring a donor-acceptor (D-A) structure, along with their metal-containing derivatives (In, Sn, Tl), under visible-light irradiation without the use of sacrificial agents. The materials were synthesized via one-step thermal polymerization of glucose-urea solutions in the presence of the selected metal species. All samples demonstrated high H2O2 production rates exceeding 2.1 mu mol h(-)(1) , with minimal decomposition (< 4 %). The incorporation of indium resulted in a reproducible enhancement (similar to 8 %), which is attributed to improved charge separation and a more favourable conduction band alignment. Scavenger experiments combined with band structure analysis suggested a shift from a sequential one-electron to a direct two-electron oxygen reduction pathway, thereby increasing both selectivity and quantum efficiency for H2O2 production. The FPP-In photocatalyst retained 96 % of its activity after five consecutive cycles, demonstrating excellent stability. These findings highlight the potential of donor-acceptor organic polymers as tuneable photocatalysts for solar-driven H2O2 synthesis and provide insights for further material optimization.